The form of nitrogen from the soil that most plants prefer is

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The form of nitrogen from the soil that most plants prefer is nitrate (NO3-). Nitrate is the form of nitrogen that is most easily taken up by plant roots and used in various metabolic processes. Ammonia (choice B) can be toxic to plants in high concentrations and must be converted to nitrate before plants can use it. Amino acids (choice A) are important organic molecules in plants but they need to be broken down into their constituent parts, including nitrogen, before they can be used. Choices C and E are not valid options for the form of nitrogen that plants prefer.

The Form of Nitrogen from the Soil That Most Plants